Working-Capital CreditThin moat

Credit is where the financial operating system earns its highest returns and runs its greatest risks. The idea is elegant: a small merchant is chronically short of working capital, and Stone — which can see his card sales and can lend against them — is unusually well placed to provide it. A loan repaid automatically out of daily receivables is convenient for the merchant and relatively secure for Stone, and it deepens the relationship far more than a payment or a deposit does. By the end of 2025 the credit book had been rebuilt to about R$2.8 billion and was growing briskly¹ again.

The phrase 'rebuilt' carries the whole cautionary tale. Stone's first serious push into lending, in 2021, went badly wrong — it expanded too fast into a receivables-registry system that was not ready, could not properly secure or collect its loans, and took painful losses that forced it to stop the business cold. That episode is the single most important thing to understand about Stone's credit ambitions, because it proved both that the opportunity is real and that the execution is unforgiving.

What Stone appears to have learned is discipline: rebuild slowly, lend mostly to merchants it already knows, secure the loans against receivables it can actually claim, and grow the book as the systems and the confidence justify. Done that way, credit is the most valuable product in the bundle — high-margin, sticky, and hard for a rival without the payment data to match. Done carelessly, it is how fintechs blow themselves up. The size of the prize and the size of the risk are, in this business, the same size.